package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     *统计指定时间区间内的营业额
     * @param begin
     * @param end
     * @return
     */
    //TODO 统计指定时间区间内的营业额
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        addDateToEnd(begin, end, dateList);

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据("已完成"的订单的金额总计)
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);

            //如果当天营业额为空，则转为0.0
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    //TODO 统计指定时间区间内的用户数据
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        addDateToEnd(begin, end, dateList);

        //存放每天新增的用户数量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);



        }

        //封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    //TODO 统计指定时间区间内的订单数据
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        addDateToEnd(begin, end, dateList);

        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            //查询每天订单总数
            Integer orderCount = orderMapper.countByMap(map);

            map.put("status", Orders.COMPLETED);
            //查询每天有效订单数
            Integer validOrderCount = orderMapper.countByMap(map);

            //添加进对应的集合
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = totalOrderCount == 0 ? 0.0 : validOrderCount.doubleValue() / totalOrderCount;

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量前10
     * @param begin
     * @param end
     * @return
     */
    //TODO 统计指定时间区间内的销量前10
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        //获取每个DTO当中的name
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());

        //湖片区每个DTO中的number
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names, ","))
                .numberList(StringUtils.join(numbers, ","))
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    //TODO 导出运营数据报表
    @Override
    public void exportBusiness(HttpServletResponse response) {
        //1、查询数据库，获取营业数据（最近30天）
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2、把查询到的数据写入到Excel文件中
        //从类路径下读取资源
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于已有模板文件创建新的excel
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的sheet标签页
            XSSFSheet sheet1 = excel.getSheet("Sheet1");

            //填充数据--时间
            //获取第二行(从0开始计数),第二个单元格
            sheet1.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //填充数据-概览数据
            //获得第四行
            XSSFRow row = sheet1.getRow(3);
            //第三个单元格--营业额
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            //第五个单元格--订单完成率
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            //第七个单元格--新增用户数
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获取第五行
            row = sheet1.getRow(4);
            //第三个单元格--有效订单数
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            //第五个单元格--平均客单价
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for(int i = 0; i < 30; i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet1.getRow(7 + i);

                //第二个单元格--日期
                row.getCell(1).setCellValue(date.toString());
                //第三个单元格--营业额
                row.getCell(2).setCellValue(businessData.getTurnover());
                //第四个单元格--有效订单数
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                //第五个单元格--订单完成率
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                //第六个单元格--平均客单价
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                //第七个单元格--新增用户数
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3、通过输出流把excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            excel.close();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void addDateToEnd(LocalDate begin, LocalDate end, List<LocalDate> dateList) {
        dateList.add(begin);
        while(!begin.equals(end)){
            //日期计算，计算指定日期后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
    }
}
